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Summary: Inherited Fields | Ctors | Methods | Inherited Methods

# InputStreamReader

`public class InputStreamReader`
`` `extends Reader` ``

java.lang.Object
↳ | java.io.Reader
| ↳ | java.io.InputStreamReader

Known direct subclasses FileReader
FileReader | Convenience class for reading character files.

An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified `charset`. The charset that it uses may be specified by name or may be given explicitly, or the platform's default charset may be accepted.

Each invocation of one of an InputStreamReader's read() methods may cause one or more bytes to be read from the underlying byte-input stream. To enable the efficient conversion of bytes to characters, more bytes may be read ahead from the underlying stream than are necessary to satisfy the current read operation.

For top efficiency, consider wrapping an InputStreamReader within a BufferedReader. For example:

     BufferedReader in
       = new BufferedReader(new InputStreamReader(System.in));

See also:

- `BufferedReader`
- `InputStream`
- `Charset`

## Summary

### Inherited fields
From class `java.io.Reader`
`protected Object` | `lock` The object used to synchronize operations on this stream.

### Public constructors
`InputStreamReader(InputStream in)` Creates an InputStreamReader that uses the default charset.
`InputStreamReader(InputStream in, String charsetName)` Creates an InputStreamReader that uses the named charset.
`InputStreamReader(InputStream in, Charset cs)` Creates an InputStreamReader that uses the given charset.
`InputStreamReader(InputStream in, CharsetDecoder dec)` Creates an InputStreamReader that uses the given charset decoder.

### Public methods
`void` | `close()` Closes the stream and releases any system resources associated with it.
`String` | `getEncoding()` Returns the name of the character encoding being used by this stream.
`int` | `read()` Reads a single character.
`int` | `read(char[] cbuf, int offset, int length)` Reads characters into a portion of an array.
`boolean` | `ready()` Tells whether this stream is ready to be read.

### Inherited methods
From class `java.io.Reader`
`abstract void` | `close()` Closes the stream and releases any system resources associated with it.
`void` | `mark(int readAheadLimit)` Marks the present position in the stream.
`boolean` | `markSupported()` Tells whether this stream supports the mark() operation.
`int` | `read()` Reads a single character.
`abstract int` | `read(char[] cbuf, int off, int len)` Reads characters into a portion of an array.
`int` | `read(char[] cbuf)` Reads characters into an array.
`int` | `read(CharBuffer target)` Attempts to read characters into the specified character buffer.
`boolean` | `ready()` Tells whether this stream is ready to be read.
`void` | `reset()` Resets the stream.
`long` | `skip(long n)` Skips characters.
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `java.lang.Readable`
`abstract int` | `read(CharBuffer cb)` Attempts to read characters into the specified character buffer.
From interface `java.io.Closeable`
`abstract void` | `close()` Closes this stream and releases any system resources associated with it.
From interface `java.lang.AutoCloseable`
`abstract void` | `close()` Closes this resource, relinquishing any underlying resources.

## Public constructors

### InputStreamReader

    public InputStreamReader (InputStream in)

Creates an InputStreamReader that uses the default charset.

Parameters
`in` | `InputStream`: An InputStream

### InputStreamReader

    public InputStreamReader (InputStream in,
                    String charsetName)

Creates an InputStreamReader that uses the named charset.

Parameters
`in` | `InputStream`: An InputStream
`charsetName` | `String`: The name of a supported `charset`

Throws
`UnsupportedEncodingException` | If the named charset is not supported

### InputStreamReader

    public InputStreamReader (InputStream in,
                    Charset cs)

Creates an InputStreamReader that uses the given charset.

Parameters
`in` | `InputStream`: An InputStream
`cs` | `Charset`: A charset

### InputStreamReader

    public InputStreamReader (InputStream in,
                    CharsetDecoder dec)

Creates an InputStreamReader that uses the given charset decoder.

Parameters
`in` | `InputStream`: An InputStream
`dec` | `CharsetDecoder`: A charset decoder

## Public methods

### close

    public void close ()

Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.

Throws
`IOException` |

### getEncoding

    public String getEncoding ()

Returns the name of the character encoding being used by this stream.

If the encoding has an historical name then that name is returned; otherwise the encoding's canonical name is returned.

If this instance was created with the `InputStreamReader(java.io.InputStream, java.lang.String)` constructor then the returned name, being unique for the encoding, may differ from the name passed to the constructor. This method will return `null` if the stream has been closed.

Returns
`String` | The historical name of this encoding, or `null` if the stream has been closed

See also:

- `Charset`

### read

    public int read ()

Reads a single character.

Returns
`int` | The character read, or -1 if the end of the stream has been reached

Throws
`IOException` | If an I/O error occurs

### read

    public int read (char[] cbuf,
                    int offset,
                    int length)

Reads characters into a portion of an array.

Parameters
`cbuf` | `char`: Destination buffer
`offset` | `int`: Offset at which to start storing characters
`length` | `int`: Maximum number of characters to read

Returns
`int` | The number of characters read, or -1 if the end of the stream has been reached

Throws
`IOException` | If an I/O error occurs

### ready

    public boolean ready ()

Tells whether this stream is ready to be read. An InputStreamReader is ready if its input buffer is not empty, or if bytes are available to be read from the underlying byte stream.

Returns
`boolean` | True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.

Throws
`IOException` | If an I/O error occurs

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